On Sunday 21 September 2008, Riccardo Iaconelli wrote: > On Monday 22 September 2008 02:04:04 Robert Knight wrote: > > Fredrik has answered this one on techbase: > > > > http://techbase.kde.org/Development/Tutorials/Graphics/Performance#QPaint > >er > > > >::setOpacity.28.29 > > This changes the opacity of the start pixmap, while I want to decrease > opacity just for that single painting operation, keeping the cached pixmap > intact. > > So the two options are: > a) create a copy of the cached pixmap and use the above trick on it. > b) use QPainter::setOpacity() > > Which one is the cheapest?
you could always experiment with either valgrind or using QTimer ... but QPainter::setOpacity always defaults to a software path that renders into a local image, and so is likely to usually be slower. -- Aaron J. Seigo humru othro a kohnu se GPG Fingerprint: 8B8B 2209 0C6F 7C47 B1EA EE75 D6B7 2EB1 A7F1 DB43 KDE core developer sponsored by Trolltech
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